Most custom software MVPs take 8–16 weeks from kick-off to launch. A cross-platform mobile app MVP typically takes 10–20 weeks, a mid-size web platform 4–9 months, and a complex marketplace longer, usually delivered in phases. Small internal tools are often quicker. Your scope, integrations and how fast you give feedback decide where you fall.
Those are typical ranges, not promises. Below you will find a timeline for each project type, a sample week-by-week plan, and the specific things that stretch or shrink a schedule.
How long does each type of project take?
Timeline grows with the number of user roles, integrations and unknowns, not just the number of features. Use this table as a starting estimate before a proper discovery.
| Project type | Typical timeline (estimate) | What usually sets the pace |
|---|---|---|
| Marketing website (for comparison) | 1–2 weeks | Content and approvals |
| Complex website or e-commerce (for comparison) | Up to about 4 weeks | Product data, payments, integrations |
| Simple internal tool / automation | Often a few weeks, quicker than an MVP | Clarity of the workflow, data import |
| MVP web app / SaaS | 8–16 weeks | Number of core features and roles |
| Mobile app MVP (cross-platform) | 10–20 weeks | Device testing, app store review |
| Mid-size web platform / SaaS | 4–9 months | Integrations, reporting, permissions |
| Complex platform / marketplace | Beyond 9 months, in phases | Two-sided flows, payments, scale |
The website rows come from GRWW's published guide for website builds and are there to show the gap: websites are mostly pages and content, while software carries logic, data and permissions, which take longer to design, build and test.
For mobile specifically, our guide on how long it takes to build a mobile app goes deeper into app store steps.
What does a 12-week MVP schedule look like?
A typical 12-week MVP spends roughly the first quarter on discovery and design, the middle half on building, and the final weeks on testing and launch. Here is an illustrative plan, not a fixed template.
| Weeks | Phase | What you see | What you do |
|---|---|---|---|
| 1–2 | Discovery | Workflow maps, user roles, prioritised feature list, fixed estimate | Attend workshops, share examples and data |
| 3 | UX and design | Wireframes, then clickable designs of key screens | Review and approve within a couple of days |
| 4 | Setup | Hosting, environments, sign-in, basic admin | Provide accounts for integrations |
| 5–9 | Build sprints | A demo on staging every week or two | Test each demo and give feedback |
| 10–11 | QA and user testing | Bug fixes, security checks, final polish | Run real scenarios with your staff |
| 12 | Launch | Production release, data import, training | Sign off and brief your team |
Notice how often the "What you do" column matters. Much of the calendar risk on a typical project sits on the client side, in feedback, decisions and access to third-party systems. That is not a criticism; it is just where the waiting happens. The full sequence is broken down in our step-by-step guide to the custom software development process.
What usually makes custom software projects run late?
Projects run late because of decisions, dependencies and scope growth far more often than slow coding. Knowing the usual culprits lets you head them off.
- Slow feedback. A design that waits a week for approval pushes everything behind it by a week.
- Scope creep. "Can it also…" requests added mid-build, without moving anything else out.
- Third-party integrations. Payment providers, banks, government portals and some industry systems need approvals, test accounts or documentation that take time to arrive.
- Messy data. Importing years of inconsistent spreadsheets often needs rounds of cleaning and decisions about what to keep.
- Unclear ownership. When several people on the client side can approve or veto, decisions stall.
- App store review. Mobile releases depend on Apple and Google reviews, and a rejection means fixing and resubmitting.
- Late content. Help text, email templates, terms and conditions and product data all need writing by someone.
Can you speed up a custom software project?
Yes, mainly by cutting scope and removing waiting time, not by adding more developers. The quickest projects are the ones with fast decisions and a disciplined first release.
Practical ways to save weeks:
- Name one decision-maker who can approve designs and answer questions within a day or two.
- Cut the first release to the features needed to replace the current process. Move the rest to phase two.
- Request integration access early. Ask for API keys, sandbox accounts and documentation during discovery, not the week they are needed.
- Prepare data before kick-off. Clean your spreadsheets and decide which records to migrate.
- Use proven building blocks. Off-the-shelf services for payments, email, SMS and sign-in save build time.
- Write content in parallel. Draft emails, help text and policies while the software is being built.
Why doesn't adding more developers make it faster?
Adding people to a project adds communication and onboarding work, which can slow things down before it speeds them up. This is well known in software as Brooks's law: adding people to a late project tends to make it later.
A small, stable team that understands your business usually beats a large team ramping up. Extra developers help when the work splits cleanly into independent parts (for example, a mobile app and an admin panel), and when they join early rather than as a rescue.
How do timelines differ for AI and integration projects?
AI and integration work often carries more unknowns than a standard web app, so it benefits from a short proof of concept before committing to a full timeline. The uncertainty is in data and third-party behaviour, not the interface.
- AI features depend on the quality of your documents or data and on testing how the model responds to real questions. Budget time for evaluation and adjustments.
- Integrations depend on how well the other system is documented and how reliable its API is. A well-documented API can be connected quickly; a poorly documented one can take much longer.
A one- or two-week proof of concept that tests the riskiest part first is often the most valuable time in the whole project.
How should a timeline estimate be presented to you?
A good estimate gives you a range, the assumptions behind it, and the milestones where you will see working software. A single date with no assumptions is a guess.
Look for:
- A phase-by-phase plan with clear deliverables.
- The assumptions: number of roles, integrations, data volume, feedback turnaround.
- What happens if an assumption changes, such as an extra integration.
- Demo dates every week or two, so slippage shows early.
Budget and timeline move together. If you are planning a product launch, our breakdown of what an MVP costs in 2026 pairs with the schedules above. Timelines are one chapter of the story; our complete custom software development guide puts them alongside cost, contracts and maintenance.
Frequently asked questions
Can an MVP really be built in a month?
A very small, single-workflow tool sometimes can. A typical MVP with sign-up, a few core features, payments and an admin panel usually takes 8–16 weeks once you include discovery, design and testing. Skipping those steps tends to create delays later.
Why is software so much slower to build than a website?
Websites are mainly pages and content. Software has business rules, user roles, data storage, integrations and edge cases, each of which needs designing, building and testing. That is why a marketing site might take 1–2 weeks while an MVP takes months.
What is the biggest cause of delays on the client side?
Slow feedback and decisions. When designs or demos wait several days for review, the whole schedule shifts. Naming a single decision-maker with time set aside is the most effective fix.
Should I set a hard launch date?
A fixed date is fine if you are willing to adjust scope to meet it. Fixing date, scope and budget all at once leaves no room for the unexpected. Agree which one can flex before the project starts.
How long after launch until the software is "finished"?
Software is rarely finished. Expect a busy first few weeks of fixes and small changes, then a regular rhythm of maintenance and improvements. Most businesses plan a second phase once they have real usage data.
Planning a launch date?
If you have a deadline in mind, tell us what it is and what the software must do by then. We will work backwards from that date, suggest what to include in the first release and send you a fixed-price, phase-by-phase plan. You can also browse our services to see the kinds of projects we take on.